I have posted here when I was a newb before.
Arena is simply messed up.
The thumbs up and down buttons don't come up when you win. This is a huge problem because let's face it. When most of us get sneak attacked by a "random deck" that came out of know where, we immediately hit the thumbs down button. I will not lie. I thumbs down 95% of the decks I lose against because most of them are unoriginal. Or just ticked me off.
Arena needs to be made to detect what kind of deck a deck is. With this kind of functionality, we can track the meta of the arena game at the moment (Zanzarino and developers only) and nerf the decks that are used too much. Even if we don't do this, at least find a way to weaken monos and rainbows being in arena. Why you may ask? I would like to build on what flyingcat said. The ignore-the-oracle-card rainbow. The oracle-card-mono. These decks are seen very often in arena. Then there is the oracle-card-splash-in-mono-darkness. I played a mono darkness with mind flayer oracle card splashed in. I quit the match on purpose just to thumbs it down and get it out of arena.
Of course, stemming off of what I said earlier, the Arena needs to be more original. It's pretty obvious. If arena was as original as we say it is, we wouldn't have decks that are able to wreck arena. Decks win against other decks because the deck made was able to counter the cards in the other decks or the deck was made to beat the player with little influence from the cards in the other deck (Basically a rush deck). If one deck, let's say for instance FEVER, is able to counter more than 80% of the decks in Silver, then 80% of the decks in Silver all carry the same weakness. A conclusion that can be made from this is that the decks are structured in such a similar way that they can be countered by the same thing. Unoriginality.
I could be wrong. It could be that the decks used against arena are exceptionally good. If that is the case, then these decks in arena are submitted by players and made by players. As far as I am concerned, players completely made the decks shoved in arena. These decks can be shoved in PvP as well. How is it that these decks such as FEVER can be used for arena and these decks can't be used for PvP? The immediate answer is the AI. Yet, this can't be the answer. Why?
An example if I may. Let's give you and the AI a hand with a lightning. A bone dragon is attacking you. Wouldn't you use your lightning to kill the dragon? The AI would too. Let's get another example. You have a steal in your hand. The enemy has a Pulverizer and a Phase Shield along with a Sanctuary. I'm betting you wouldn't target the sanctuary. The AI wouldn't either. The AI plays very similar to a real player. So, the decks made by players should play like actual players would play. With this logic, if the decks in silver aren't all made the same way and it is FEVER that is making silver look bad, then I should be able to walk into PvP 1 and 2 and wreck everyone with FEVER. You can't. The decks in arena are simply unoriginal. I wait for the counter-argument.